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Integer signum() Method in Java
• Last Updated : 05 Dec, 2018

The signum function is an odd mathematical function that extracts the sign of a real number. The signum function is also known as sign function.
The Integer.signum() method of java.lang returns the signum function of the specified integer value. For a positive value, a negative value and zero the method returns 1, -1 and 0 respectively.

Syntax :

`public static int signum(int a)`

Parameter: The method takes one parameter a of integer type on which the opearation is to be performed.

Return Value: The method returns the signum function of the specified integer value. If the specified value is negative it returns -1, 0 if the specified value is zero and 1 if the specified value is positive.

Examples:

```Consider an integer a = 27
Since 27 is a positive int signum will return= 1

Consider another integer a = -61
Since -61 is a negative int signum will return= -1

Consider the integer value a = 0
For a zero signum, it will return = 0 ```

Below programs illustrate the Java.lang.Integer.signum() Method:
Program 1:

 `// Java program to illustrate the ` `// Java.lang.Integer.signum() Method ` `import` `java.lang.*; ` ` `  `public` `class` `Geeks { ` ` `  `public` `static` `void` `main(String[] args) { ` ` `  `    ``// It will return 1 as  the int value is greater than 1 ` `    ``System.out.println(Integer.signum(``1726``)); ` ` `  `    ``// It will return -1 as  the int value is less than 1 ` `    ``System.out.println(Integer.signum(-``13``)); ` ` `  `    ``// It will returns 0 as int value is equal to 0 ` `    ``System.out.println(Integer.signum(``0``)); ` `} ` `}  `

Output:

```1
-1
0
```

Program 2:

 `// Java program to illustrate the ` `// Java.lang.Integer.signum() Method ` `import` `java.lang.*; ` ` `  `public` `class` `Geeks { ` ` `  `public` `static` `void` `main(String[] args) { ` ` `  `    ``// It will return 1 as  the int value is greater than 1 ` `    ``System.out.println(Integer.signum(-``1726``)); ` ` `  `    ``// It will return -1 as  the int value is less than 1 ` `    ``System.out.println(Integer.signum(``13``)); ` ` `  `    ``// It will returns 0 as int value is equal to 0 ` `    ``System.out.println(Integer.signum(``0``)); ` `} ` `}  `

Output:

```-1
1
0
```

Program 3: For a decimal value and string.
Note: It returns an error message when a decimal value and string is passed as an argument.

 `// Java program to illustrate the ` `// Java.lang.Integer.signum() Method ` `import` `java.lang.*; ` ` `  `public` `class` `Geeks { ` ` `  `public` `static` `void` `main(String[] args) { ` ` `  `    ``//retuns compile time error as passed argument is a decimal value ` `    ``System.out.println(Integer.signum(``3.81``)); ` `     `  `     `  `    ``//retuns compile time error as passed argument is a string  ` `    ``System.out.println(Integer.signum(``"77"``)); ` ` `  ` `  `} ` `}  `

Output:

```prog.java:10: error: incompatible types: possible lossy conversion from double to int
System.out.println(Integer.signum(3.81));
^
prog.java:14: error: incompatible types: String cannot be converted to int
System.out.println(Integer.signum("77"));
^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
```

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